It spins fast! It can spin with very little friction. It can spin without any friction. If you have your office chair at home and if you do this experiment, be very careful! Now I sit on this chair. So what? Nothing. Now I have weights in my hands. People don't stay close to me, and I will start spinning. Uhhh... Spinning. So what? Nothing interest
This is why every building reacts differently to earthquakes. You'd think the tallest building is always the worst. But the moment the earthquake changes, you can see the middle one becomes the worst. And that's because most people are completely wrong about which building is actually in the most danger. Since even the smallest building can end up
The simple equation that governs pendulums. Here's the mass and it's offset at an angle theta. The length of the pendulum is L, the length of the string. There is gravity here, mg, and the other force on the object, the only other force, is the tension T. And now comes the wonderful result, x double dot plus g over L times x equals zero. And this i
200 balls, one hair apart, dropped from the exact centre, from rest. The butterfly effect: each bounce multiplies the difference by seven. Deterministic and completely unpredictable. Nothing here is random: identical balls, identical physics. 0.1 mm of doubt was all it took.
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